中文说明：下面的部分包含了粗糙集理论的基本框架的概述，最初提出的 ；zdzisłAW I.帕夫拉克，随着一些关键定义。更正式的性质和粗糙集的边界可以发现在Pawlak（1991）引用的参考文献。粗糙集的初始和基本理论有时也被称为“Pawlak粗糙集或“ ； ；“经典粗糙集”，以区别于最近的扩展和推广。
English Description：
The following section contains an overview of the basic framework of rough set theory, initially proposed by & nbsp; zdzis ł aw I. pavlac, along with some key definitions. More formal properties and boundaries of rough sets can be found in the references cited in Pawlak (1991). The initial and basic theory of rough set is sometimes called "Pawlak rough set" or "& nbsp; & nbsp;" classical rough set "to distinguish it from the recent extension and generalization.